The Connecticut-based chain has stores in Folsom and Roseville, and plans to open another at 6001 Florin Rd. in Sacramento this fall, spokeswoman Malena Wilson said.

Wayback Burgers' 133 stores are adding a combined 3,400 gallons of ice cream, 300 gallons of chocolate syrup, 300 gallons of Monin French vanilla syrup and 30,000 cups, lids and straws to their usual stock this year, according to a media release.

Premium content for only $0.99

Each location gives out an average of 280 free shakes on the first day of summer, and Wayback Burgers typically sees a 20-25 percent jump in sales as customers add hamburgers, fries or other food to their orders. The 27-year-old company has been giving out free milkshakes for summer solstice since 2008.

The Bee's Benjy Egel is launching a new effort to cover Sacramento's dining and beer scene. Please send tips and story ideas by email at begel@sacbee.com, on Twitter @BenjyEgel or by phone at (916) 321-1052.